I can't recommend any of these since I'm not using such a monster, but that would be a good overview of large fans. The technical information to each of them contains the air flow and sometimes pressure, so I think you should be able to choose something from that. The largest are 250mm, however some of the 230mm has higher air flow rate.

Other possible sources are industrial/maintenance supply houses such as Grainger.com or Newark, HVAC supply houses, or if you want something really big and noisy with high air flow to strap on the side of a case, 12v radiator cooling fans from an automotive parts supplier. But those are gonna draw some juice!Cats.....what more does one need?

Yes, what Mark mentioned, or any of the high-airflow units from newegg I posted, will draw some serious current, regardless of the voltage... Make sure your PSU is up to par for what you are trying to do.

Yes, what Mark mentioned, or any of the high-airflow units from newegg I posted, will draw some serious current, regardless of the voltage... Make sure your PSU is up to par for what you are trying to do.

@Slavac: LOL! :-D

Of course, another PSU sparing option....run the high powered fans from the AC mains rather than using a 12v unit powered from the PSU.Cats.....what more does one need?

Yes, what Mark mentioned, or any of the high-airflow units from newegg I posted, will draw some serious current, regardless of the voltage... Make sure your PSU is up to par for what you are trying to do.

In 1967, as a freshman at MIT, I took a survey course in aeronautics taught by a grand old man of the department (Otto Koppen--designer of the Helio Courier). One of the precepts he taught was "grab as much air as possible and do as little with it as possible".

While fans do vary in how well they are shaped, how efficient their motors are, and such, in general you are likely to find that both noise per unit airflow and power consumption per unit airflow will be superior on large diameter fans moving slowing than on small ones moving fast.

Watch out for noise, in particular. The fan people have a funny way of measuring it, which means that even 30 dB is readily audible. So when one admits to 66.5 dBA (as does the top one on that NewEgg list), it quite likely is a real screamer. That same fan admits to pulling 48W, or 4.8 Amps out of the 12V supply.

Of course, if you don't care about noise, power, or efficiency, you can move a lot of air with a really small fan turning at a screaming rate. Check out the things they put in slender server cases. A really good programmer I know had a boss who as a special favor arranged to get a server PC for his office. He first disabled half the fans (it bragged of having redundancy, so cooling would be adequate with multiple fan failures), but still could not stand the noise level--the thing got banished to a machine room.

Yes, what Mark mentioned, or any of the high-airflow units from newegg I posted, will draw some serious current, regardless of the voltage... Make sure your PSU is up to par for what you are trying to do.

I just bought 2 SilverStone 180mm Air Penetrator fans (model no. SST-AP181) and modded 1 of my old Antec Titan 650 server cases with 1 fan in the top, the other in the side over the video cards.

With these fans there is a grill built in on the outlet side that directs the air straight instead of letting the air fan out and these can run at 7V (80cfm, quiet) or 12V (130cfm, noticeable) but they have improved the case cooling dramatically running at just 7V.

This image and these specs appear to have been found by the person posting on Anandtech on an Amazon listing. If you type "12V radiator fan" into Amazon's search window, and restrict the answer to Automotive--you'll see quite a few offerings. Just possibly something there might suit you.

Going back to my power efficiency comments, while this one is nearly 100 watts, it claims many times higher airflow than the 48 watt fan at the top of the Newegg list.

Have a look at automotive fans, they shift some air, most are 12V (avoid trucks and RVs which are often 24V). But they do draw some current, don't be surprised at tens of amps if you got up to 500mm or more!Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?

I guess how you want to use the fan really comes down to what you really want. I have some 120vac 120mm fans that probably move several hundred CFM, but they make about as much noise as a 474 taking off from the runway. I was using them to cool my Celeron 333MHz with a sandwich cooler to get it up to 666MHz.
Later I got a commercial 30" air circulator. Which I placed on the floor by my desk and had it blow into/through the case. Made less noise and was as effective.

If you have a limit on the amount of noise you are willing to tolerate then you can find the highest volume fan that makes that much or less noise.